These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

Three columns of volcanic rock shoot out of the ocean.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Hear the quietest sound from across the dome.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

Macabre astrological automaton clock dating to the late 1400s.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

The world's brightest bioluminescent bay.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

This strange geological landscape erupts with sudden bursts of water.

The glacier tucked within a New Zealand rainforest.

A perfect turquoise lake colored with glacier dust.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.